Using characteristicYXKD2 series adpot hydraulic electromegnetic theory. Widely used in outdoor din-rail transformer..as protection for transformerYXKD2 series slove the unstable factors of big discreteness of fuse current,aging and poor contact caused by oxidation.even in the extremly cold and hot enviroment it also can supply accurate and stable protection.YXKD2 series has two connection modes screw and socket.,the connection part of socket way has three intercommunicating contact .circuit breaker is herizenly installed,the install position is the same as fuse plate.it is easy to intall and replace.YXKD2 series provide continous working self-recovery function specilly for railway electric stage base on the normal circuit breaker.avoid the infulence of railway open to traffic caused by the instant current shock,the trip protection of circuit breaker and the long timeYXKD2 series has a transparent dust cover on the actuator lever,it has the antipollution function.Certificate and standardRCC[2007]650 railway singal hydraulic electromegnetic circuit breaker telchnology GB14048.2-2001 low voltage breaker equipement and control equiment low voltage circuit breakerD1series also applied TB/T publiced by the railway department .VDE0642 and EN 60934 |Trip characteristic in normal temperature

NO.of delay curve and trip characteristicvalue (sec)

Rated current percentage (A)

105%

130%

150%

200%

400%

600%

800%

1000%

1500%

Short delay curve21

No trip

8-180

5-40

2-20

0.005-1.8

0.003-0.03

0.003-0.022

0.003-0.02

0.003-0.02

Middle delay curve22

No trip

25-550

20-150

15-50

1-6.5

0.01-2

0.004-0.8

0.003-0.18

0.003-0.025

Long delay curve23

No trip

90-1000

50-360

30-100

3.5-20

1-7

0.02-4

0.005-0.2

0.004-0.03

suggest to choose short delay curve 23All the curve data is gotten at the temperature of 25 degree and havent added the time of load working trip time. vertically installedWhen the the rated current is 105% it deosnt trip.when the rated current is above 130%,it should trip in the trip characteristic valueBase on 60HZ 1/2 cycle 8.33ms pulse.the capbility of minimum inrushed pluse is 12 times as rated current and when in high pulse it is 18 times as rated current .the trip time is in aboveHigh pulse delay is used in power supply bulk capacitorand , load transformer and so on which has the big initial current in short time.